fix: remove Top K in retrieval testing #770 and if the document parsing fails, the error message returned by the backend is displayed (#782)

### What problem does this PR solve?

fix: remove Top K in retrieval testing  #770
fix: if the document parsing fails, the error message returned by the
backend is displayed.

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

web/src/pages/document-viewer/file-error/index.tsx

@@ -1,13 +1,17 @@
 import { Alert, Flex } from 'antd';
 
 import { useTranslate } from '@/hooks/commonHooks';
+import React from 'react';
 import styles from './index.less';
 
-const FileError = () => {
+const FileError = ({ children }: React.PropsWithChildren) => {
   const { t } = useTranslate('fileManager');
   return (
     <Flex align="center" justify="center" className={styles.errorWrapper}>
-      <Alert type="error" message={<h1>{t('fileError')}</h1>}></Alert>
+      <Alert
+        type="error"
+        message={<h2>{children || t('fileError')}</h2>}
+      ></Alert>
     </Flex>
   );
 };